Manufacture of glass lamp-founts



(NoModel.)

G. E. HATCH. Manufacture of Glass Lampy Founns. No..242,63s. Patented June 7,1881.

N. PETERS. Pholmljlhugmphnr. Walhlngun. D. C.

UNITED STATES PATENT GEEICE.

GEORGE E. HATCH, oF MEEIDEN, CONNECTICUT.

MANUFACTURE OF GLASS LAMP-FOUNTS.

SPECIFICATION forming part of Letters Patent No. 242,638, dated June 7, 1881. Application tiled March 21, 1881. (No model.)

To all whom it may concern:

Be it known that I, GEORGE E. HATCH, of Meriden, in the county of New Haven and State of Connecticut, have invented a new Improvenient in the Manufacture of Glass Lamp- Founts; and I do hereby declare the following, when taken in connection with the accom panyingdrawings and thelettersof referencemarked thereon, to be a full, clear, and exact descrip tion of the same, and which said drawings constitute partoi' this specication, and represent, 1n-

Figure l, a vertical section of' the fount; Fig. L', a vertical central section of the mold; Fig. 3, a vertical central section, showing the method of finishing the i'ount. f

This invention relates to an improvement in makinglamp-tbunts such as are constructed with a chamber for the oil and a surrounding chamber to be charged withcarbonic-acid gas, and known as the Westland Safety-Lamp;7 the object being to construct the fount in the usual shape or" other lamp-fonn ts with a double wall, instead ot spherical, as heretofore; and the invention consists in the method ot' construction, as hereinafterdescribed, and particularly recited in the claims.

In Fig. l, which shows the fount in vertical section, A represents the oil-chamber, and B the surrounding gas-chamber, the outline or exterior of the fount being ot' the well-known frustum-ofcone shape.

In manufacturingsuch fountsemployamold, C, of the exterior' shape of the fount, as usual, andinto this the glassis placed andafollower,]), introduced therein. Thefollower is constructed at its lower end so much smaller than the mold as to leave a space, a, for the outer wall of the fount, and in the end of the follower there is a concentric cavity, 1,01? a depth and thickness equal to the height and thickness of the inner wall, c, in the fount, Fig. 1. The follower is forced into the mold after the glass is placed therein, causing the glass to low up into the cavity d, and also into the space at the sides and above the height ot the inner wall, so as to extend the walls of the fount-say to about the height indicated at f. This operation produces the blank of the fount, (shown in section, Fig. 3.) This blank is then heated in the usual manner of working glass, and the extension at the sides is worked over to form the top into connection with the walls c, and so as to form the usual central neck, E, and

'as seen in broken lines, Fig. 3, and shown in Fig. 1,. By this method ot' making the fount tot'ore globe shape, supposed to bevthe onlyshape in which the said safety-lamp could be conveniently made. Y

It should be remarked that there must be escapes for the air in the cavity d in the follower, and this may be done by making apertures from the cavities outward through the follower, as seen in broken lines, Fig. 2.

In some cases the founts are 'made in reverse shape-that is, the larger diameter at the bottom-and in so doing the method of molding is reversed, the bottom being closed over after molding, instead ot' the top.

The vbottom of the lamp is provided with a stem or cavity, or neither, as the case may be, and as in the usual construction.

It will be understood that there must be an opening at some point forcliarging the gaschamber or space between the two walls.

I am aware 'that it is not new to extend the wall ot' glass articles in molding, and subsequently work the extended walls inward and over to form the topand bottom of the article, and therefore do not broadly claim such as my invention.

I claiml. The herein-described mold for making double-walled lamp-founts, consisting of the mold" C, having a cavity therein corresponding to the outside of the fount, and a follower arranged to enter said mold and leave therein a space for the outer wall and an extension thereof, and also constructed with a cavity, d, to shape the Yinner wall, substantially as described.

2. The herein-described improvement in making double-wall lamp-founts, consisting in placing the glass from which the fount is to be made in a mold corresponding to the eXterior of the outer wall of the lamp-fount, then forcing a follower into said mold, the said follower constructed at its end to correspond to the inside of the outer wall, and with a cavity IOO 2 s i o 242.635

in its end corresponding to the inner wall, so and so as to com plete the fount, substantially that ashthe 1folloiwl'ler is forced1 fl'ito the inoll1 as described.

upon t e g ass t e g ass wil ow into sai 1 cavity to form said inner wall, and around the v GEO' E' HATDH outside of the follower to form the outer Wall Witnesses:

and an extension thereof, said extension bein g JNO. M. BLACKBURN,

subsequently turned over onto the inner Walls I. C. LYON, Jr. 

